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2x+4+4x=5x-21
We move all terms to the left:
2x+4+4x-(5x-21)=0
We add all the numbers together, and all the variables
6x-(5x-21)+4=0
We get rid of parentheses
6x-5x+21+4=0
We add all the numbers together, and all the variables
x+25=0
We move all terms containing x to the left, all other terms to the right
x=-25
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